Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income	$ 14,904us-gaap_NetIncomeLoss	$ 15,273us-gaap_NetIncomeLoss	$ 17,925us-gaap_NetIncomeLoss
Income (loss) from discontinued operations, net of tax	0	223	(135)
Income from continuing operations	14,904	15,050	18,060
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	6,702	6,768	6,858
Deferred income taxes	3,385us-gaap_DeferredIncomeTaxExpenseBenefit	2,805us-gaap_DeferredIncomeTaxExpenseBenefit	4,540us-gaap_DeferredIncomeTaxExpenseBenefit
Impairment of intangible assets	1,936	2,033	0
Broadcast program rights amortization	637sga_BroadcastProgramRightsAmortization	637sga_BroadcastProgramRightsAmortization	614sga_BroadcastProgramRightsAmortization
Amortization of deferred costs	187us-gaap_AmortizationOfFinancingCosts	204us-gaap_AmortizationOfFinancingCosts	231us-gaap_AmortizationOfFinancingCosts
Compensation expense related to restricted stock awards	826us-gaap_RestrictedStockExpense	135us-gaap_RestrictedStockExpense	110us-gaap_RestrictedStockExpense
(Gain) loss on sale of assets	(1,281)	(126)	221
Other (gains) losses, net	0us-gaap_OtherNonoperatingGainsLosses	20us-gaap_OtherNonoperatingGainsLosses	59us-gaap_OtherNonoperatingGainsLosses
Share-based compensation expense	0us-gaap_StockOptionPlanExpense	0us-gaap_StockOptionPlanExpense	22us-gaap_StockOptionPlanExpense
Barter revenue, net	(208)us-gaap_OtherNoncashIncomeExpense	(11)us-gaap_OtherNoncashIncomeExpense	(294)us-gaap_OtherNoncashIncomeExpense
Deferred and other compensation	(129)	19	3
Write-off of debt issuance costs	0	55	0
Income tax expense (benefit) on exercise of options	10	(13)	0
Changes in assets and liabilities:
Decrease (increase) in receivables and prepaid expenses	(1,521)us-gaap_IncreaseDecreaseInReceivables	160us-gaap_IncreaseDecreaseInReceivables	(742)us-gaap_IncreaseDecreaseInReceivables
Payments for broadcast program rights	(627)sga_PaymentsForBroadcastProgramRights	(628)sga_PaymentsForBroadcastProgramRights	(626)sga_PaymentsForBroadcastProgramRights
(Decrease) increase in accounts payable, accrued expenses, and other liabilities	595	(396)	1,850
Total adjustments	10,512	11,662	12,846
Net cash provided by continuing operating activities	25,416	26,712	30,906
Net cash provided by discontinued operating activities	0	0	49
Net cash provided by operating activities	25,416	26,712	30,955
Cash flows from investing activities:
Acquisition of property and equipment	(5,524)	(5,152)	(4,809)
Proceeds from sale and disposal of assets	90	792	42
Proceeds from sale of networks	1,640	0	0
Proceeds from sale of television station	0sga_ProceedsFromSaleOfTelevisionStation	2,960sga_ProceedsFromSaleOfTelevisionStation	0sga_ProceedsFromSaleOfTelevisionStation
Acquisition of broadcast properties	(903)	0	0
Other investing activities	(11)	(410)	(157)
Net cash used in continuing investing activities	(4,708)	(1,810)	(4,924)
Net cash used in discontinued investing activities	0	0	(34)
Net cash used in investing activities	(4,708)	(1,810)	(4,958)
Cash flows from financing activities:
Payments on long-term debt	(10,000)us-gaap_RepaymentsOfLongTermDebt	(12,750)us-gaap_RepaymentsOfLongTermDebt	(10,250)us-gaap_RepaymentsOfLongTermDebt
Cash dividends paid	(10,419)us-gaap_PaymentsOfDividendsCommonStock	(10,326)us-gaap_PaymentsOfDividendsCommonStock	(7,010)us-gaap_PaymentsOfDividendsCommonStock
Payments for debt issuance costs	0us-gaap_PaymentsOfDebtIssuanceCosts	(289)us-gaap_PaymentsOfDebtIssuanceCosts	0us-gaap_PaymentsOfDebtIssuanceCosts
Other financing activities	(10)	176	187
Net cash used in financing activities	(20,429)	(23,189)	(17,073)
Net increase in cash and cash equivalents	279	1,713	8,924
Cash and cash equivalents, beginning of year	17,628	15,915	6,991
Cash and cash equivalents, end of year	$ 17,907	$ 17,628	$ 15,915

No authoritative reference available.

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Other income (expense) included in net income that results in no cash inflows or outflows in the period. Includes noncash adjustments to reconcile net income (loss) to cash provided by (used in) operating activities that are not separately disclosed.

+ References

+ Details

Name:	us-gaap_OtherNoncashIncomeExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Other aggregate amounts of gains or losses resulting from nonoperating activities (for example, interest and dividend revenue, property, plant and equipment impairment loss, and so forth.) not otherwise defined.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 9

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.7,9)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3095-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

+ References

+ Details

Name:	us-gaap_PaymentsOfDebtIssuanceCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

+ References

+ Details

Name:	us-gaap_PaymentsOfDividendsCommonStock
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

+ Details

Name:	us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3095-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow from disposal of asset without physical form usually arising from contractual or other legal rights, excluding goodwill.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Aggregate cash proceeds received from a combination of transactions that are classified as investing activities in which assets, which may include one or more investments, are sold to third-party buyers. This element can be used by entities to aggregate proceeds from all asset sales that are classified as investing activities.

+ References

No definition available.

+ Details

Name:	us-gaap_ProceedsFromSalesOfAssetsInvestingActivities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation.

+ References

+ Details

Name:	us-gaap_RestrictedStockExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation.

+ References

+ Details

Name:	us-gaap_StockOptionPlanExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.8)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration